多年生优良牧草——苜蓿的草害问题,我国多习用人工除草,费工费时。目前,药剂除草正在探索,尚无大面积的成功经验。美国太平洋西北地区对苜蓿的化学除草,已有系统的防除方法,应用的除草剂也较多,结合国内药源情况,介绍如下: 一、新播苜蓿防除阔叶杂草: 当苜蓿苗具有2—4片三出复叶,杂草幼苗低于八厘米高时,苗后施用二四滴丁酸,用量37.35—112克/亩。经常连续使用,某些一年生阔叶杂草如蓼、藜、篇蓄、繁缕已被证明有 Perennial excellent forage - alfalfa grass problems, more artificial herbicides in our country, time-consuming work. At present, weeding herb is being explored, there is no large-scale successful experience. United States Pacific Northwest on the chemical weed control of alfalfa, there are systematic methods of prevention and control, the application of more herbicides, combined with the domestic drug sources are described below: First, the new sowing control of broad-leaved weed alfalfa: When alfalfa seedlings have 2 -4 tablets out of three leaves, weed seedlings less than eight centimeters high, after the application of two or four drops of butyric acid, the amount of 37.35-112 g / acre. Often continuous use, certain annual broadleaf weeds such as Polygonum, quinoa, articles storage, chickweed has been proven to have